Decrease In Mean Body Temperature Research Articles

The Effects of Dietary Interventions on Cardiovascular Indexes among Individuals with Cold and Hot Temperaments Based on Persian Medicine

This study aimed to explore potential relationships between dietary patterns aligned with cold or hot temperaments and cardiovascular parameters among healthy individuals. This randomized clinical trial was conducted in 2020 with 65 healthy volunteers. Participants were categorized into two groups, specifically as hot or cold temperaments. In the initial phase, we measured body temperature, systolic and diastolic blood pressure, and conducted the Heart Rate Variability (HRV) test. Subsequently, participants received a three-day diet plan with a similar nature to their body temperament (second phase). The same measurements were repeated after three days. Following this, participants returned to a normal daily diet for three days. In the third phase, they received a diet plan of the opposite nature to their temperament for another three days, and the same battery of tests was conducted at the study's conclusion. In both the cold temperament group during the second phase and the hot temperament group during the third phase, mean body temperature, heart rate, systolic and diastolic blood pressure were significantly lower than in other phases (P < 0.05). Additionally, HRV indexes, including RMSSD, SDNNInd, and QT, were significantly higher during the second phase for the cold temperament group and the third phase for the hot temperament group compared to other phases (P < 0.05). Irrespective of individual body temperament, the consumption of a cold-natured diet led to a significant decrease in mean body temperature, heart rate, systolic and diastolic blood pressure. This effect may be attributed to the activation of the parasympathetic nervous system.

Effective Field Immobilization of Andean Fox (Lycalopex culpaeus) with Ketamine-Dexmedetomidine and Antagonism with Atipamezole

A combination (mean±SD) of ketamine (4.0±1.0 mg/kg in juveniles and 3.0±0.4 in adults) and dexmedetomidine (0.055±0.01 and 0.049±0.01, respectively), reversed with atipamezole (at 10 mg/mg of dexmedetomidine), was assessed in 57 Andean foxes (Lycalopex culpaeus) in field conditions. Induction times in juveniles and adults were 4.6±3.9 min and 4.3±2.4 min, respectively. Immobilization was smooth and safe, and lasted 50±8 min in juveniles and 50±10 min in adults. Full recovery was recorded at 40±29 min in juveniles and 37±23 min in adults after atipamezole administration. Drug dose, season, body temperature, and fox sex and body condition were not related to variations in induction and recovery times, body temperature, heart rate, respiratory rate, or hemoglobin oxygen saturation. No side effects were observed other than a slight but significant decrease in mean body temperature during the procedure. This combination allowed carrying out all the typical procedures of a research project, including the collection of several biologic samples.

Mega Acer Kit® is more effective for warming the intravenous fluid than Ranger™ and ThermoSens® at 440 ml/h of infusion rate: an experimental performance study.

BackgroundFew studies have investigated the effectiveness of intravenous fluid warmers at low and moderate flow rates below 1,000 ml/h. In this study, we compared the effectiveness of three different fluid warmers at a low flow rate (440 ml/h).MethodsWe experimentally investigated the fluid warming performances of Mega Acer Kit® (Group M, n = 10), Ranger™ (Group R, n = 10), and ThermoSens® (Group T, n = 10) at 440 ml/h for 60 min. All devices were set at a warming temperature of 41℃ with preheating for 10 min. Intravenous fluids were then delivered through them. The fluid temperature (primary endpoint) was measured at 76 cm from the device after infusion for 60 min. The expected decrease in mean body temperature (secondary endpoint) after 5 h infusion for a 70 kg patient (ΔMBT5) was also calculated.ResultsThe fluid temperature (mean [95% CI]) at 76 cm from the device, 60 minutes after the infusion was higher in group M (36.01 [35.73–36.29]℃), compared to groups T (29.81 [29.38–30.24]℃) and R (29.12 [28.52–29.72]℃) (P < 0.001). The ΔMBT5 (mean [95% CI]) was significantly smaller in group M (−0.04 [−0.04 to −0.03]℃) than that in groups T (−0.27 [−0.28 to −0.29]℃; P < 0.001) and R (−0.30 [−0.32 to −0.27]℃; P < 0.001). However, none of the fluid warmers provided a constant normothermic temperature above 36.5℃.ConclusionsMega Acer Kit® was more effective in warming the intravenous fluid with the smallest expected change in the mean body temperature, compared to Ranger™ and ThermoSens®, at a flow rate of 440 ml/h.

Cool echidnas survive the fire.

Fires have occurred throughout history, including those associated with the meteoroid impact at the Cretaceous-Palaeogene (K-Pg) boundary that eliminated many vertebrate species. To evaluate the recent hypothesis that the survival of the K-Pg fires by ancestral mammals was dependent on their ability to use energy-conserving torpor, we studied body temperature fluctuations and activity of an egg-laying mammal, the echidna (Tachyglossus aculeatus), often considered to be a 'living fossil', before, during and after a prescribed burn. All but one study animal survived the fire in the prescribed burn area and echidnas remained inactive during the day(s) following the fire and substantially reduced body temperature during bouts of torpor. For weeks after the fire, all individuals remained in their original territories and compensated for changes in their habitat with a decrease in mean body temperature and activity. Our data suggest that heterothermy enables mammals to outlast the conditions during and after a fire by reducing energy expenditure, permitting periods of extended inactivity. Therefore, torpor facilitates survival in a fire-scorched landscape and consequently may have been of functional significance for mammalian survival at the K-Pg boundary.

Changes in Body Temperature and Intestinal Antioxidant Enzymes in Healthy and Colitis Male Rats: Role ofGarciniakola

The status of body temperature and antioxidant/free radical balance can be used as an index of health, the presence and progression of disease conditions. Studies have shown that Garcinia kola (GK), an agricultural produce exhibits numerous health benefits. The present study investigated the effect of pretreatment with a crude extract of GK on Mean body temperature (MBT) and antioxidant enzymes in normal and colitis male rats induced by acute Acetic acid (AA) instillation. Twenty adult male albino rats weighing 120-150g were randomly divided into vehicle, GK, AA and GK+AA groups. Rats were treated respectively with distilled water and 150mg/kg of GK per day for three weeks. Acetic acid was induced through a single intra-colic instillation of 1ml/200g/BWT of 7% acetic acid. The result showed that GK- treatment did not lead to a statistical decrease in MBT when compared with vehicle, but there was a significant reduction in GK treated group when compared with AA and GK+AA groups respectively. Intestinal superoxide dismutase SOD and catalase of GK-treated rats were significantly elevated (P<0.05) when compared with vehicle, AA and GK+AA groups. GK treatment caused a significant reduction (P<0.05) in intestinal malondialdehyde when compared with vehicle, AA and GK+AA groups. Therefore, GK administration alleviated hyperthermia in acetic acid inducedcolitis and improved intestinal antioxidant enzymes in both healthy and colitis male rats.

Using body temperature, food and water consumption as biomarkers of disease progression in mice with Eμ-myc lymphoma

Background:Non-invasive biomarkers of disease progression in mice with cancer are lacking making it challenging to implement appropriate humane end points. We investigated whether body temperature, food and water consumption could be used to predict tumour burden.Methods:Thirty-six male, wild-type C57Bl/6 mice were implanted with subcutaneous RFID temperature sensors and inoculated with Eμ-myc tumours that infiltrate lymphoid tissue.Results:Decrease in body temperature over the course of the study positively predicted post-mortem lymph node tumour burden (R2=0.68, F(1,22)=44.8, P<0.001). At experimental and humane end points, all mice that had a mean decrease in body temperature of 0.7 °C or greater had lymph nodes heavier than 0.5 g (100% sensitivity), whereas a mean decrease in body temperature <0.7 °C always predicted lymph nodes lighter than 0.5 g (100% specificity). The mean decrease in food consumption in each cage also predicted mean post-mortem lymph node tumour burden at 3 weeks (R2=0.89, F(1,3)=23.2, P=0.017).Conclusion:Temperature, food and water consumption were useful biomarkers of disease progression in mice with lymphoma and could potentially be used more widely to monitor mice with other forms of cancer.

Intraoperative use of a reflective blanket (Sirius® rescue sheet) for temperature management in dogs less than 10 kg

To compare the effects of the Sirius rescue sheet with gel pads versus gel pads alone on intraoperative body temperature in dogs less than 10 kg. Forty small breed dogs undergoing elective surgical procedures were randomly assigned to two groups. One group was intraoperatively laid on warmed gel pads, and the other group was additionally wrapped in a Sirius rescue sheet. Oesophageal body temperature was determined every 10 minutes and compared between groups. Temperature of gel pads was measured preoperatively and postoperatively to compare heat loss of the gel pads between groups. The body temperature of dogs wrapped with the Sirius rescue sheet increased intraoperatively. In dogs just lying on warmed gel pads, a decrease in mean body temperature was revealed and mean body temperatures differed between groups after 40 minutes. Extent of heat loss from the gel pads did not differ between the groups. The Sirius rescue sheet, used in addition to warmed gel pads, led to higher intraoperative body temperatures in small breed dogs undergoing surgical procedures to the extremities and the head. The cost-effectiveness and ease of handling make this a useful addition to clinical practice.

Effect of warm intravenous and irrigating fluids on body temperature during transurethral resection of the prostate gland

BackgroundTransurethral resection of the prostate gland with irrigation fluid at room temperature leads to perioperative hypothermia which could give rise to adverse cardiovascular events in the perioperative period. The use of isothermic irrigation fluid reduces but does not eliminate this risk. Routine use of warm intravenous fluids along with isothermic irrigation had not been documented. This study set out to investigate the effect of the use of warm intravenous fluid together with isothermic irrigation fluid on the body temperature in patients undergoing transurethral resection of the prostate gland.MethodsOne hundred and twenty consented patients with obstructing benign prostatic hyperplasia were randomly assigned to one of 3 groups. Group 1 received irrigation and intravenous fluids at room temperature, group 2 received warmed irrigation fluid at 38°C along with intravenous fluid at room temperature while group 3 patients received warmed irrigation fluid and warmed intravenous fluids at 38°C. Their perioperative body temperature changes were monitored, analyzed and compared.ResultsThe mean decrease in body temperature at the end of the procedure was significantly greater in group 1 (0.98 ± 0.56°C) than in group 2 (0.42 ± .21°C) (p < 0.001). Significantly more patients in group 1 also experienced shivering. However, in group 3, there was no significant change in the mean body temperature (p > 0.05) and none of them felt cold or shivered.ConclusionIt is concluded that the use of isothermic irrigation fluid together with warm intravenous fluids during TURP prevents the occurrence of perioperative hypothermia.Trial registration numberCCT-NAPN-15944

Body Temperature Responses in Spinal Cord Injured Individuals During Exercise in the Cold and Heat

The aim of this study was to assess the effect of arm exercise on the heat balance in spinal cord-injured (SCI) individuals with complete lesions at ambient temperatures of 10 and 35 degrees C. Four SCI with a high lesion (> or = T6) (SCI-H), seven with a low lesion (< T6) (SCI-L), and ten able-bodied controls (AB) performed arm-cranking exercises at 40 % of the maximal power output for 45 min, once in 10 degrees C and once in 35 degrees C. Oxygen uptake, rectal temperature, and skin temperature (chest, upper arm, thigh, calf) were measured at rest and 15, 30, and 45 min after the onset of exercise. Metabolism, heat production, skin temperature, mean body temperature (a combination of rectal and skin temperature), and body heat content were calculated. Heart rate at 10 degrees C was 103 b/min in SCI-H, 120 in SCI-L and 112 in AB, while in 35 degrees C, heart rate was 112 b/min in SCI-H, 144 in SCI-L and 134 in AB. The increase in rectal temperature in 35 degrees C was larger in SCI-L (+ 0.07 degrees C) and SCI-H (+ 0.08 degrees C) than in AB (+ 0.06 degrees C). The decrease in mean body temperature at 10 degrees C was larger in SCI-H (33.0 +/- 0.68 degrees C) than in SCI-L (33.6 +/- 0.29 degrees C) and AB (34.5 +/- 0.31 degrees C). During exercise in 35 degrees C, mean body temperature increased in all three groups. The increase in body temperature in SCI-L was larger than in AB. During exercise in 10 degrees C, body heat content decreased in SCI-H (80.0 +/- 15.1 kJ) and SCI-L (89.2 +/- 9.1 kJ) but remained constant in AB (97.0 +/- 16.1 kJ). During exercise in 35 degrees C, body heat content increased in all three groups. The increase in body heat content after exercising in 35 degrees C was not significantly different between the three groups. In summary, mean body temperature and body heat content in the cold decreased in SCI, despite exercising. In the heat, mean body temperature and body heat content seems to increase more in SCI than in AB. We can conclude that SCI are at a greater risk for a disturbed heat balance during exercise in the cold and in the heat than AB. Both in the cold and in the heat, precautions should be taken even earlier and be more intensive for SCI than for AB.

Acetylsalicylic Acid and Acetaminophen to Combat Elevated Body Temperature in Acute Ischemic Stroke

Background: Because elevated body temperature (BT) in acute ischemic stroke is associated with poor outcome, it is currently recommended to maintain normothermia with antipyretics. Whether this can be achieved by the administration of acetylsalicylic acid (ASA) or acetaminophen is uncertain. Methods: Over a period of 9 months, patients admitted with acute hemiparetic ischemic stroke were monitored for BT in the first 48 h. When BT rose >37.5°C, patients were treated with either ASA 500 mg intravenously or acetaminophen suppository 1,000 mg. When 6 h later the BT was still or again >37.5°C, patients were further treated with acetaminophen suppository 1,000 mg up to 4 times a day. Primary outcome measure was normothermia (BT ≤37.5°C) within respectively 1 and 3 h after intervention. Secondary outcome parameters were any decrease in BT and the mean decrease in BT. Results: Of a total of 132 patients, 63 (48%) developed a BT >37.5°C. The effects of 43 injections of ASA and 89 administrations of acetaminophen were studied. After 1 h, treatment with acetaminophen produced both significantly more reductions in BT and normothermia (respectively in 60 and 20%) than treatment with ASA (respectively in 37 and 5%). At 3 h, both interventions had a similar effect, with normothermia being achieved in only 37–38%. Fever (>38.0°C) and evidence of an infection were related to unresponsiveness to treatment. Conclusions: In the majority of patients with acute ischemic stroke, ASA and acetaminophen are insufficient for reducing an elevated BT to a state of normothermia.

Efficacy of intraoperative heat administration by ventilation with warm humidified gases and an oesophageal warming system

We measured changes in body temperature in 12 hypothermic (mean aural temperature 34.4 (SD 1.0) degrees C) pigs during general anaesthesia with an open abdominal cavity and the effect of two warming systems: heating of inspired gases to 39 degrees C (intratracheal temperature) and oesophageal warming to 39 degrees C by a water perfused oesophageal heat exchanger. Each animal underwent both treatments and the control period in random sequence. Each condition was studied over 1 h. No additional protection against heat loss (drapes, blankets, i.v. fluids warming, etc.) was used. Anaesthesia, room temperature and relative humidity, amount and temperature of infusions and extension of exposed visceral surfaces were standardized. Mean decrease in body temperature was 1.0 (0.7) degree C (P < 0.005) without warming and 0.6 (0.2) degree C (P < 0.005) with heated inspired gases: this difference was not statistically significant. Oesophageal warming was very efficient as mean body temperature did not change significantly (-0.1 (0.2) degree C; ns).

Rewarming of feet by lower and upper body exercise.

The capacity of different types of exercise to rewarm the body, especially the feet, was studied. Six healthy male subjects wearing winter clothing (2.4 clo, 0.37 degrees C.m2.W-1) were exposed on three occasions to -15 degrees C for 120 min. For the first 60 min the subjects were cooled while sitting motionless and for the latter 60 min they were submitted to cycle ergometer exercise (CE), arm ergometer exercise (AE) or step exercise (ST). The rate of work in CE (about 350 W) served as a reference value for AE and ST. The cooling resulted in an average 1.7 (SEM 0.03) degrees C decrease in mean body temperature (Tb) corresponding to a 425 (SEM 9) kJ heat debt. The ST increased most effectively mean skin, rectal and lower body skin temperatures as well as dry heat loss. The ST increased Tb by 0.83 (SEM 0.16) degrees C, CE by 0.10 (SEM 0.11) degrees C and AE by only 0.07 (SEM 0.12) degrees C. At the end of the exercise the foot temperature was approximately 6 degrees C higher in ST than in CE. The superior rewarming by ST was apparently due to its low mechanical efficiency. Because the increase in Tb could not explain all the changes in foot temperatures, increased circulation and metabolism of the feet would also appear to have been involved.

Dose-dependent hypothermia and lithium toxicity in albino mice ( Mus musculus L.)

1. 1. Thermoregulation in adult male albino mice was studied following i.p. injection of lithium chloride in doses ranging from 20 to 800 mg/kg. 2. 2. The 24-h LD 50 was 600 mg/kg. 3. 3. Dose-dependent hypothermia was evident 1h after injection of 50–800 mg/kg. After 5h temperatures had returned to normal for all groups except those injected with 600 and 800 mg/kg. 4. 4. The lowest dose that produced a significant decrease in mean body temperature was 100 mg/kg. The maximum decrease in temperature without concomitant mortality (5°C) was produced by a dose of 400 mg/kg.